Java Tutorial/SWT/Tree Editor
Содержание
Add Tree cell editor
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/
//package org.eclipse.swt.snippets; /*
* TreeEditor example snippet: edit the text of a tree item (in place, fancy) * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TreeEditor; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class TreeCellEditor {
public static void main(String[] args) {
final Display display = new Display();
final Color black = display.getSystemColor(SWT.COLOR_BLACK);
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER);
for (int i = 0; i < 16; i++) {
TreeItem itemI = new TreeItem(tree, SWT.NONE);
itemI.setText("Item " + i);
for (int j = 0; j < 16; j++) {
TreeItem itemJ = new TreeItem(itemI, SWT.NONE);
itemJ.setText("Item " + j);
}
}
final TreeItem[] lastItem = new TreeItem[1];
final TreeEditor editor = new TreeEditor(tree);
tree.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
final TreeItem item = (TreeItem) event.item;
if (item != null && item == lastItem[0]) {
boolean isCarbon = SWT.getPlatform().equals("carbon");
final Composite composite = new Composite(tree, SWT.NONE);
if (!isCarbon)
composite.setBackground(black);
final Text text = new Text(composite, SWT.NONE);
final int inset = isCarbon ? 0 : 1;
composite.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event e) {
Rectangle rect = composite.getClientArea();
text.setBounds(rect.x + inset, rect.y + inset, rect.width - inset * 2, rect.height
- inset * 2);
}
});
Listener textListener = new Listener() {
public void handleEvent(final Event e) {
switch (e.type) {
case SWT.FocusOut:
item.setText(text.getText());
composite.dispose();
break;
case SWT.Verify:
String newText = text.getText();
String leftText = newText.substring(0, e.start);
String rightText = newText.substring(e.end, newText.length());
GC gc = new GC(text);
Point size = gc.textExtent(leftText + e.text + rightText);
gc.dispose();
size = text.ruputeSize(size.x, SWT.DEFAULT);
editor.horizontalAlignment = SWT.LEFT;
Rectangle itemRect = item.getBounds(),
rect = tree.getClientArea();
editor.minimumWidth = Math.max(size.x, itemRect.width) + inset * 2;
int left = itemRect.x,
right = rect.x + rect.width;
editor.minimumWidth = Math.min(editor.minimumWidth, right - left);
editor.minimumHeight = size.y + inset * 2;
editor.layout();
break;
case SWT.Traverse:
switch (e.detail) {
case SWT.TRAVERSE_RETURN:
item.setText(text.getText());
// FALL THROUGH
case SWT.TRAVERSE_ESCAPE:
composite.dispose();
e.doit = false;
}
break;
}
}
};
text.addListener(SWT.FocusOut, textListener);
text.addListener(SWT.Traverse, textListener);
text.addListener(SWT.Verify, textListener);
editor.setEditor(composite, item);
text.setText(item.getText());
text.selectAll();
text.setFocus();
}
lastItem[0] = item;
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
Exchanging Data
- Set the text from the cell into your editor"s control when you create the control.
- Set the text from the control back into the cell any time it"s modified.
Add Combo to Table as the Cell Editor and Exchange data between them
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.CCombo; import org.eclipse.swt.custom.TableEditor; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; public class TableCellEditorComboDataExchange {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Text Table Editor");
shell.setLayout(new FillLayout());
final Table table = new Table(shell, SWT.SINGLE | SWT.FULL_SELECTION | SWT.HIDE_SELECTION);
table.setHeaderVisible(true);
table.setLinesVisible(true);
for (int i = 0; i < 5; i++) {
TableColumn column = new TableColumn(table, SWT.CENTER);
column.setText("Column " + (i + 1));
column.pack();
}
for (int i = 0; i < 5; i++) {
final TableItem item = new TableItem(table, SWT.NONE);
}
final TableEditor editor = new TableEditor(table);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
table.addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent event) {
Control old = editor.getEditor();
if (old != null)
old.dispose();
Point pt = new Point(event.x, event.y);
final TableItem item = table.getItem(pt);
if (item == null) {
return;
}
int column = -1;
for (int i = 0, n = table.getColumnCount(); i < n; i++) {
Rectangle rect = item.getBounds(i);
if (rect.contains(pt)) {
column = i;
break;
}
}
if (column != 1) {
return;
}
final CCombo combo = new CCombo(table, SWT.READ_ONLY);
for (int i = 0; i < 3; i++) {
combo.add("" + i);
}
combo.select(combo.indexOf(item.getText(column)));
editor.minimumWidth = combo.ruputeSize(SWT.DEFAULT, SWT.DEFAULT).x;
table.getColumn(column).setWidth(editor.minimumWidth);
combo.setFocus();
editor.setEditor(combo, item, column);
final int col = column;
combo.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
item.setText(col, combo.getText());
combo.dispose();
}
});
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Press F2 to launch a dialog as the Tree Editor
- You can also associate the editor with a button to launch a dialog box for editing tree nodes.
- You create the editor and control just like you do with the other editor classes.
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TreeEditor; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class TreeEditorF2Trigger {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Text Tree Editor");
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.SINGLE);
for (int i = 0; i < 3; i++) {
TreeItem iItem = new TreeItem(tree, SWT.NONE);
iItem.setText("Item " + (i + 1));
for (int j = 0; j < 3; j++) {
TreeItem jItem = new TreeItem(iItem, SWT.NONE);
jItem.setText("Sub Item " + (j + 1));
for (int k = 0; k < 3; k++) {
new TreeItem(jItem, SWT.NONE).setText("Sub Sub Item " + (k + 1));
}
jItem.setExpanded(true);
}
iItem.setExpanded(true);
}
final TreeEditor editor = new TreeEditor(tree);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
tree.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent event) {
if (event.keyCode == SWT.F2 && tree.getSelectionCount() == 1) {
final TreeItem item = tree.getSelection()[0];
int style = SWT.ICON_QUESTION |SWT.YES | SWT.NO;
MessageBox messageBox = new MessageBox(shell, style);
messageBox.setMessage("Message");
int rc = messageBox.open();
item.setText(rc+"");
}
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Use Button as the Tree Editor
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TreeEditor; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class TreeEditorButton {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Text Tree Editor");
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.SINGLE);
for (int i = 0; i < 3; i++) {
TreeItem iItem = new TreeItem(tree, SWT.NONE);
iItem.setText("Item " + (i + 1));
for (int j = 0; j < 3; j++) {
TreeItem jItem = new TreeItem(iItem, SWT.NONE);
jItem.setText("Sub Item " + (j + 1));
for (int k = 0; k < 3; k++) {
new TreeItem(jItem, SWT.NONE).setText("Sub Sub Item " + (k + 1));
}
jItem.setExpanded(true);
}
iItem.setExpanded(true);
}
final TreeEditor editor = new TreeEditor(tree);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
tree.addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent event) {
final TreeItem item = tree.getSelection()[0];
final Button bn = new Button(tree, SWT.NONE);
bn.setText("click");
bn.setFocus();
bn.addSelectionListener(new SelectionListener() {
public void widgetSelected(SelectionEvent arg0) {
int style = SWT.ICON_QUESTION | SWT.YES | SWT.NO;
MessageBox messageBox = new MessageBox(shell, style);
messageBox.setMessage("Message");
int rc = messageBox.open();
item.setText(rc + "");
bn.dispose();
}
public void widgetDefaultSelected(SelectionEvent arg0) {
}
});
editor.setEditor(bn, item);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Use Mouse action to activate(install) Tree editor
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TreeEditor; import org.eclipse.swt.events.FocusAdapter; import org.eclipse.swt.events.FocusEvent; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class TreeEditorMouseActivate {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Text Tree Editor");
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.SINGLE);
for (int i = 0; i < 3; i++) {
TreeItem iItem = new TreeItem(tree, SWT.NONE);
iItem.setText("Item " + (i + 1));
for (int j = 0; j < 3; j++) {
TreeItem jItem = new TreeItem(iItem, SWT.NONE);
jItem.setText("Sub Item " + (j + 1));
for (int k = 0; k < 3; k++) {
new TreeItem(jItem, SWT.NONE).setText("Sub Sub Item " + (k + 1));
}
jItem.setExpanded(true);
}
iItem.setExpanded(true);
}
final TreeEditor editor = new TreeEditor(tree);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
tree.addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent event) {
final TreeItem item = tree.getSelection()[0];
final Text text = new Text(tree, SWT.NONE);
text.setText(item.getText());
text.selectAll();
text.setFocus();
text.addFocusListener(new FocusAdapter() {
public void focusLost(FocusEvent event) {
item.setText(text.getText());
text.dispose();
}
});
text.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent event) {
switch (event.keyCode) {
case SWT.CR:
item.setText(text.getText());
case SWT.ESC:
text.dispose();
break;
}
}
});
editor.setEditor(text, item);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Use Text as the Table Cell Editor
<source lang="java">
import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TableEditor; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.Text; public class TableCellEditorText {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Text Table Editor");
shell.setLayout(new FillLayout());
final Table table = new Table(shell, SWT.SINGLE | SWT.FULL_SELECTION | SWT.HIDE_SELECTION);
table.setHeaderVisible(true);
table.setLinesVisible(true);
for (int i = 0; i < 5; i++) {
TableColumn column = new TableColumn(table, SWT.CENTER);
column.setText("Column " + (i + 1));
column.pack();
}
// Create five table editors for color
TableEditor[] colorEditors = new TableEditor[5];
// Create five buttons for changing color
Text[] textEditor = new Text[5];
for (int i = 0; i < 5; i++) {
final TableItem item = new TableItem(table, SWT.NONE);
colorEditors[i] = new TableEditor(table);
textEditor[i] = new Text(table, SWT.SINGLE|SWT.BORDER);
textEditor[i].setText("editor");
textEditor[i].ruputeSize(SWT.DEFAULT, table.getItemHeight());
colorEditors[i].grabHorizontal = true;
colorEditors[i].minimumHeight = textEditor[i].getSize().y;
colorEditors[i].minimumWidth = textEditor[i].getSize().x;
colorEditors[i].setEditor(textEditor[i], item, 0);
}
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>
Using TreeEditor
- A TreeEditor allows users to edit the text associated with a tree"s nodes.
- TreeEditor is derived from ControlEditor.
- Its parent is always a Tree, which is passed in the constructor:
<source lang="java">
public TreeEditor(Tree parent)</source>
